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| author | Alan Stern <stern@rowland.harvard.edu> | 2013-03-22 13:31:45 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-25 13:35:05 -0700 |
| commit | 6e018751a35f6ef7ad04eb8006b5886b6a7c47f5 (patch) | |
| tree | e1dde22b7aa1ac3566ebbbd29b78df611e05c572 /drivers/usb/host/ehci-hcd.c | |
| parent | 7655e3160c78a18c2ecf7bf4dee0bbfe58575c7f (diff) | |
| download | lwn-6e018751a35f6ef7ad04eb8006b5886b6a7c47f5.tar.gz lwn-6e018751a35f6ef7ad04eb8006b5886b6a7c47f5.zip | |
USB: EHCI: convert singly-linked lists to list_heads
This patch (as1664) converts ehci-hcd's async_unlink, async_iaa, and
intr_unlink from singly-linked lists to standard doubly-linked
list_heads. Originally it didn't seem necessary to use list_heads,
because items are always added to and removed from these lists in FIFO
order. But now with more list processing going on, it's easier to use
the standard routines than continue with a roll-your-own approach.
I don't know if the code ends up being notably shorter, but the
patterns will be more familiar to any kernel hacker.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 87fe3daaa092..b32323ca07d3 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -482,6 +482,9 @@ static int ehci_init(struct usb_hcd *hcd) * periodic_size can shrink by USBCMD update if hcc_params allows. */ ehci->periodic_size = DEFAULT_I_TDPS; + INIT_LIST_HEAD(&ehci->async_unlink); + INIT_LIST_HEAD(&ehci->async_iaa); + INIT_LIST_HEAD(&ehci->intr_unlink); INIT_LIST_HEAD(&ehci->intr_qh_list); INIT_LIST_HEAD(&ehci->cached_itd_list); INIT_LIST_HEAD(&ehci->cached_sitd_list); @@ -749,7 +752,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) /* guard against (alleged) silicon errata */ if (cmd & CMD_IAAD) ehci_dbg(ehci, "IAA with IAAD still set?\n"); - if (ehci->async_iaa) + if (!list_empty(&ehci->async_iaa)) COUNT(ehci->stats.iaa); end_unlink_async(ehci); } |